Coriolis mass flowmeter

Abstract

A Coriolis mass flowmeter with a measuring tube through which a medium can flow, at least one actuator and at least one sensor, wherein the measuring tube is bent between its input and output ends into a first winding and a second winding, the first winding and the second winding merging into one another at a transitional section of the measuring tube. The first winding and the second winding run in parallel winding planes and wherein the first winding and the second winding can be excited to oscillation by the actuator and the oscillations detected by the sensor. The Coriolis mass flowmeter is comparably insensitive to the coupling of external oscillations in that oscillating sections of the first winding and the second winding are bent into a V shape that opens in a direction toward the transitional section of the measuring tube.

What is claimed is: 
     
       1. Coriolis mass flowmeter, comprising:
 a measuring tube though which a medium is able to flow, 
 at least one actuator and 
 at least one sensor 
 wherein the measuring tube has been bent between an input end and an output end into a into a first winding and a second winding, the first winding and the second winding having V shape and merging into one another at a transitional section of the measuring tube, the first winding and the second winding running in parallel winding planes with open sides of the V shape facing toward the transitional section of the measuring tube, 
 wherein the actuator is able to excite oscillating sections of the first winding and the second winding into oscillation and 
 wherein the sensor is able to detect oscillations of the winding sections. 
 
     
     
       2. Coriolis mass flowmeter according to  claim 1 , wherein the transitional section of the measuring tube is located in a base plane in which input and the output ends of the measuring tube are located. 
     
     
       3. Coriolis mass flowmeter according to  claim 2 , wherein the winding planes are perpendicular to the base plane. 
     
     
       4. Coriolis mass flowmeter according to  claim 2 , wherein legs of the V shape of at least one of the first winding and the second winding are disposed a the same angle relative to the base plane. 
     
     
       5. Coriolis mass flowmeter  claim 1 , wherein the actuator is joined to the apex of the V-shape of the windings. 
     
     
       6. Coriolis mass flowmeter  claim 2 , wherein the transitional section of the measuring tube has an S shape in said base plane. 
     
     
       7. Coriolis mass flowmeter  claim 1 , further comprising a housing in which the measuring tube is located and wherein the measuring tube is provided with a central mass in at least one of the transitional section and end sections of the measuring tube, the central mass being permanently attached to the housing. 
     
     
       8. Coriolis mass flowmeter  claim 7 , wherein the measuring tube is provided with an input section mass in the input section. 
     
     
       9. Coriolis mass flowmeter  claim 1 , further comprising a housing in which the measuring tube is located and wherein an input section of the measuring tube is permanently attached to the housing. 
     
     
       10. Coriolis mass flowmeter  claim 7 , wherein the measuring tube is provided with an output section mass in the output section. 
     
     
       11. Coriolis mass flowmeter  claim 1 , further comprising a housing in which the measuring tube is located and wherein an output section of the measuring tube is permanently attached to the housing. 
     
     
       12. Coriolis mass flowmeter according to  claim 1 , wherein an input end of the transitional section is attached to an input section mass. 
     
     
       13. Coriolis mass flowmeter according to  claim 12 , wherein an output end of the transitional section is attached to an output section mass. 
     
     
       14. Coriolis mass flowmeter  claim 1 , wherein the oscillating sections of the first and second windings are connected by a first node plate on each of spaced ends of the legs of the V shape. 
     
     
       15. Coriolis mass flowmeter according to  claim 14 , wherein a second node plate connects one of the legs of the V shape of the windings at a location between the input end of the measuring tube and the first node plate near the input end of the measuring tube, and wherein another second node plate connects the other of the legs of the V shape of the windings at a location between the output end of the measuring tube and the first node plate near the output end of the measuring tube. 
     
     
       16. Coriolis mass flowmeter  claim 1 , wherein the first winding and the second winding have a maximum winding diameter of less than 15 cm. 
     
     
       17. Coriolis mass flowmeter  claim 1 , wherein the measuring tube has a maximum inner diameter of 2 mm, and a maximum wall thickness of 0.3 mm.